| Type: | Bishop |
| Honorific-Prefix: | The Most Reverend |
| Ross Roe MacMahon | |
| Archbishop of Armagh, Primate of All-Ireland | |
| Church: | Roman Catholic Church |
| See: | Armagh |
| Term: | 1747 — 1748 |
| Predecessor: | Bernard MacMahon |
| Successor: | Michael O'Reilly |
| Birth Place: | Enagh, County Monaghan |
| Death Date: | 29 October |
| Previous Post: | Bishop of Clogher (1737 - 1747) |
Ross Roe MacMahon (born 1698 in Enagh, County Monaghan) was ordained to the priesthood in 1727. He was appointed as Roman Catholic Bishop of Clogher on 8 November 1738 following the appointment of his predecessor, Bernard MacMahon, to the see of Armagh on 8 November 1737.[1] Bishop MacMahon was himself appointed to the same see on 3 August 1747; he died in Armagh on 29 October 1748. Bishop MacMahon served as Bishop of Clogher for just under nine years.